WSC checks to see if there is an antivirus (and firewall) program on the machine, if it is scanning real time, and if its signatures are up-to-date. If any of these conditions aren't met, the user receives an alert. So, it wouldn't do much good to integrate ClamWin into WSC until it is upgraded to real-time scanning status.

WSC detects AV/firewall programs by either of two methods: a Windows database via Microsoft or manually via AV vendor-supplied APIs linking their information to WSC. Hopefully, ClamWin will go real-time this year, and I'm sure Alch (and the other team members) are working on the API or getting placed in the database.